Active Disturbance Rejection Control for Underactuated PWM Rectifier Based on Equivalent Input Disturbance Error Estimation

Aiming at the problem of abnormal operation of three-phase voltage-type pulse width modulation (PWM) rectifier caused by factors such as voltage transformation and external disturbances, a control strategy is proposed that integrates active disturbance rejection control (ADRC) with equivalent input disturbance (EID) error estimation and a new terminal fuzzy sliding mode current control. By analyzing the underactuated characteristics of the three-phase voltage-type PWM rectifier system, a novel dual-closed-loop controller is constructed. The inner current loop adopts a terminal fuzzy sliding mode control strategy based on EID error estimation, while the outer voltage loop employs an ADRC strategy based on EID error estimation. To enhance controller accuracy and optimize control performance, error estimation is applied to mitigate current chattering and negative sequence current issues inherent in sliding mode control. Furthermore, harmonic components in the voltage loop are effectively suppressed, improving the voltage response speed and ensuring the stable operation of the three-phase voltage-type PWM rectifier under disturbance conditions. Finally, the proposed control strategy is validated through simulation experiments, demonstrating its effectiveness and superiority.